ARM: dts: imx6ul-geam: Skip suffix -kit from dts name

Engicam SOM's with mounted on starter kits like icorem6(rqs), isiot
usually not explicitly named with -kit in dts file names and
instead Model has mentioned 'Starter kit' So apply the same rule
for geam SOM as well.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>